电子选发器采用数码信号控制换档和电子开关选通，从而克服了机械选发器的弊端。

It adopts the digital code signal to control the gear changing and the states of the electric switch.

youdao

电子选发器采用数码信号控制换档和电子开关选通，从而克服了机械选发器的弊端。

It adopts the digital code signal to control the gear changing and the states of the electric switch.

youdao